diff options
Diffstat (limited to 'ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMCosePairCoseKeyTag.java')
-rw-r--r-- | ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMCosePairCoseKeyTag.java | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMCosePairCoseKeyTag.java b/ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMCosePairCoseKeyTag.java new file mode 100644 index 0000000..5290da2 --- /dev/null +++ b/ready_se/google/keymint/KM300/Applet/src/com/android/javacard/keymaster/KMCosePairCoseKeyTag.java @@ -0,0 +1,89 @@ +package com.android.javacard.keymaster; + +import javacard.framework.ISO7816; +import javacard.framework.ISOException; +import javacard.framework.Util; + +/** + * KMCosePairCoseKeyTag represents a key-value type, where key can be KMInteger or KMNInteger and + * value is KMCoseKey type. struct{byte TAG_TYPE; short length; struct{short COSE_KEY_VALUE_TYPE; + * short key; short value}}. + */ +public class KMCosePairCoseKeyTag extends KMCosePairTagType { + + public static final byte[] keys = {KMCose.COSE_LABEL_COSE_KEY}; + private static KMCosePairCoseKeyTag prototype; + + private KMCosePairCoseKeyTag() {} + + private static KMCosePairCoseKeyTag proto(short ptr) { + if (prototype == null) { + prototype = new KMCosePairCoseKeyTag(); + } + instanceTable[KM_COSE_KEY_COSE_KEY_VAL_OFFSET] = ptr; + return prototype; + } + + // pointer to an empty instance used as expression + public static short exp() { + short ptr = instance(COSE_PAIR_TAG_TYPE, (short) 6); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), KMType.COSE_PAIR_COSE_KEY_TAG_TYPE); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), KMType.INVALID_VALUE); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), KMCoseKey.exp()); + return ptr; + } + + public static short instance(short keyPtr, short valuePtr) { + if (!isKeyValueValid(KMCosePairTagType.getKeyValueShort(keyPtr))) { + ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED); + } + if (KMType.getType(valuePtr) != COSE_KEY_TYPE) { + ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED); + } + short ptr = KMType.instance(COSE_PAIR_TAG_TYPE, (short) 6); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE), KMType.COSE_PAIR_COSE_KEY_TAG_TYPE); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 2), keyPtr); + Util.setShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4), valuePtr); + return ptr; + } + + public static KMCosePairCoseKeyTag cast(short ptr) { + byte[] heap = repository.getHeap(); + if (heap[ptr] != COSE_PAIR_TAG_TYPE) { + ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED); + } + // Validate the value pointer. + short valuePtr = Util.getShort(heap, (short) (ptr + TLV_HEADER_SIZE + 4)); + if (KMType.getType(valuePtr) != COSE_KEY_TYPE) { + ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED); + } + return proto(ptr); + } + + public static boolean isKeyValueValid(short keyVal) { + short index = 0; + while (index < (short) keys.length) { + if ((byte) (keyVal & 0xFF) == keys[index]) { + return true; + } + index++; + } + return false; + } + + public short getValueType() { + return COSE_KEY_TYPE; + } + + @Override + public short getKeyPtr() { + return Util.getShort( + heap, (short) (instanceTable[KM_COSE_KEY_COSE_KEY_VAL_OFFSET] + TLV_HEADER_SIZE + 2)); + } + + @Override + public short getValuePtr() { + return Util.getShort( + heap, (short) (instanceTable[KM_COSE_KEY_COSE_KEY_VAL_OFFSET] + TLV_HEADER_SIZE + 4)); + } +} |